casting of object to retrieve individual value from arraylist

[looper]

Hi, i am having a problem as im new to c#. I did an arraylist and store my "uid" and want to put it into a row of pictures

pic 1 , pic 2 , pic 3, pic 4

this is my code for putting the "uid" the arraylist

pofile2.aspx.cs

ArrayList list2 = new ArrayList();
//query to get uid
thesql = "select * from Student where caregroupID= @CareGroupID";
 
using (SqlCommand cmd = new SqlCommand(thesql, con))
{
  cmd.Parameters.AddWithValue("CareGroupID", Session["caregroupID"].ToString());
  con.Open();
 
  using (SqlDataReader reader = cmd.ExecuteReader())
  {
      while (reader.Read())
      {
          list2.Add(reader["uid"].ToString());
      }
  }
  Session["horse"] = list2;
  con.Close();
}
 

I understand my Session becomes an object and so i have to cast it back.
This is my aspx page where i tried to cast it.

<%ArrayList mylist = (ArrayList)Session["horse"];%> 
<!--fb:fan profile_id="171381255280" name="caregroup" stream="0" connections="8" width="250"></fb:fan-->
</form>
<div>
    <table cellpadding=0 cellspacing=11>
    <tr>
        <%for (int i = 0; i < 8; i++)%>
      <%{ %>
        <td> 
        <fb:profile-pic uid="<%=mylist[i].ToString()%>" facebook-logo="false" width="50" height="50"linked="true" />
        </td>
      <%}%>
    </tr>
    </table>
</div>
 

But it seems like i can't put the cast at my ASPX page. The error states the namespace arraylist does not exist, Any idea what other solution can be used?

[Plater]

Well your error could probably be fixed by saying System.Collections.ArrayList
(or adding the System.Collections namespace for it)

However, if you are interested in display tabluar data in a webpage, I recomend looking up the DataTable object(and the SqlDataAdapter to fill it), then using a GridView object to handle the table building

[looper]

where do i put the System.Collections.ArrayList
in my ASPX page?
Like <%System.Collections.ArrayList ;%>

Sorry Im really new to this

[Plater]

I would go to the code file, since the exception is probably on the line:
ArrayList list2 = new ArrayList();
And put the cursor over the first ArrayList word. A little red line will probably appear under the last letter. If you move over it, a drop down will appear allowing you to add the namespace if you want?

[looper]

There is no error in the ArrayList list2 = new ArrayList(); i have all the namespace needed for the code file. But it is in my ASPX page where there is error in <%ArrayList mylist = (ArrayList)Session["horse"];%>.

Hope you guys can understand me.

[GaryTexmo]

I was under the impression that Platter meant...

<%System.Collections.ArrayList myList = (System.Collections.ArrayList)Session["horse"];%>

Platter? I've never put C# code on a web page before, so maybe you can't do this...

[Plater]

Yes Gary that is a valid way of doing it.
I think is a way to do the namespace part in the web page side as well, but i cannot remember the format

[GaryTexmo]

I did a bit of googling... does this help at all?
http://msdn.microsoft.com/en-us/library/ms164642.aspx

It seems you need to put the namespace references in a web.config file somewhere. This looks like it talks about VB, but I found this same information in relation to C#... so maybe it works like this too?

As I said, I don't know much about this kind of thing, just trying to be helpful. It's definitely confusing... give me a compiler any day! ;)

[Plater]

Are you positive its on the webpage part and not the code part?
I just threw this line in a page:
<%ArrayList mylist = new ArrayList();%>
And it accepted it just fine, no errors

[looper]

Thanks guys im able to add <%ArrayList list2 = (ArrayList)Session["horse"];%> right now. It is after i put <add namespace="System.Collections"/> in my webconfig namespace.

But i have another problem now. My list2 in my <fb:profile-pic uid="<%=list2%>"
does not work. Any idea what should i put to get all the uid from the loop?

<%ArrayList list2 = (ArrayList)Session["horse"];%>
<%for (int i = 0; i < 8; i++)%>
 
              <%{ %>
 
              <td> 
 
              <fb:profile-pic uid="<%=list2%>" facebook-logo="false" width="50" height="50"linked="true" />
              </td>
 
              <%}%>
 

[looper]

Hi again, i did another alternative

<%ArrayList list2 = (ArrayList)Session["horse"];%> 
<table cellpadding=0 cellspacing=11>
<tr>
              <td> 
              <fb:profile-pic uid="<%=list2[0]%>" facebook-logo="true" width="50" height="50"linked="true" />
              </td>
              <td> 
              <fb:profile-pic uid="<%=list2[1]%>" facebook-logo="true" width="50" height="50"linked="true" />
              </td>
              <td> 
              <fb:profile-pic uid="<%=list2[2]%>" facebook-logo="true" width="50" height="50"linked="true" />
              </td>
              <td> 
              <fb:profile-pic uid="<%=list2[3]%>" facebook-logo="true" width="50" height="50"linked="true" />
              </td>
              <td> 
              <fb:profile-pic uid="<%=list2[4]%>" facebook-logo="true" width="50" height="50"linked="true" />
              </td>
 
</tr>
<tr>
              <td> 
              <fb:profile-pic uid="<%=list2[5]%>" facebook-logo="true" width="50" height="50"linked="true" />
              </td>
              <td> 
              <fb:profile-pic uid="<%=list2[6]%>" facebook-logo="true" width="50" height="50"linked="true" />
              </td>
              <td> 
              <fb:profile-pic uid="<%=list2[7]%>" facebook-logo="true" width="50" height="50"linked="true" />
              </td>
              <td> 
              <fb:profile-pic uid="<%=list2[8]%>" facebook-logo="true" width="50" height="50"linked="true" />
              </td>
              <td> 
              <fb:profile-pic uid="<%=list2[9]%>" facebook-logo="true" width="50" height="50"linked="true" />
              </td>
 
</tr>
</table>
 

But it has an error saying Index was out of range. Must be non-negative and less than the size of the collection. I know in my sql there are only 6 uid, How do i make the array or arraylist size unlimited?

[Plater]

If there are only 6 entries, why would you think doing list2[9] would work?

[looper]

Yea! i did it!
Now it works

 
 
</form> 
<div> 
    <table cellpadding=0 cellspacing=11> 
    <tr> 
<%ArrayList mylist = (ArrayList)Session["horse"];%>  
        <%for (int i = 0; i < list2.Count; i++)%> 
      <%{ %> 
        <td>  
        <fb:profile-pic uid="<%=mylist[i]>" facebook-logo="false" width="50" height="50"linked="true" /> 
        </td> 
      <%}%> 
    </tr> 
    </table> 
</div> 
 
 
 

haha, but it gives me one row only does anyone know how to split my pic

like

pic 1, pic 2, pic 3
pic 4, pic 5, pic 6

[Plater]

Just start doing the math out?